For a 2024 Mercedes I don’t think I’m even allowed to know what’s wrong with it. Hardly anything in modern cars is user-serviceable. Can I replace the airbags? Change their timing or velocity? Alter parameters of the antilock brakes, or emissions control? No way, never. Many of those systems have to be replaced wholesale by people specially trained.
The same argument holds, and for similar reasons, with phones. Anyone with a screwdriver could service an old Bell phone. Today it’s almost impossible to take most of them apart at all without destroying them, and the majority of their function is completely invisible and untouchable anyway (software).
We’ve added a huge amount of technology not just to vehicles, but to the tools we use to maintain them. Of course labor will be more expensive as it gets more specialized. Of course parts will be more expensive as they get more capable and more complex.